com.baidu.terminator.manager.service.LogServiceImpl.java Source code

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Here is the source code for com.baidu.terminator.manager.service.LogServiceImpl.java

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/*  
 *    Copyright(C) 2010-2013 Baidu Group
 *  
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *  
 */
package com.baidu.terminator.manager.service;

import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;

import org.springframework.stereotype.Service;

import com.baidu.terminator.manager.bo.Log;
import com.baidu.terminator.manager.bo.ServerStatus;
import com.baidu.terminator.manager.common.exception.LinkStatusException;
import com.baidu.terminator.manager.common.file.FileUtils;
import com.baidu.terminator.manager.common.log.LinkLogger;

@Service("logService")
public class LogServiceImpl extends BaseLinkService implements LogService {

    private static final long MAX_READ_BYTES = 1024 * 512;

    @Override
    public Log readLog(int linkId, long offset) throws IOException {
        String logFileLocation = LinkLogger.getLogFileLocation(linkId);
        FileUtils.createFile(logFileLocation);

        RandomAccessFile raf = null;
        List<String> lines = new ArrayList<String>();
        long length = 0;

        try {
            raf = new RandomAccessFile(logFileLocation, "r");
            raf.seek(offset);
            length = raf.length();

            long point = raf.getFilePointer();
            while (point < length) {
                String line = raf.readLine();
                String utf8Line = new String(line.getBytes("8859_1"), "utf-8");
                lines.add(utf8Line);

                if (point - offset >= MAX_READ_BYTES) {
                    length = point;
                    break;
                }
                point = raf.getFilePointer();
            }
        } finally {
            if (raf != null) {
                raf.close();
            }
        }

        Log log = new Log();
        log.setLogLocation(logFileLocation);
        log.setOffset(length);
        log.setContent(lines);
        return log;
    }

    @Override
    public void deleteLog(int linkId) throws LinkStatusException {
        checkLinkStatus(linkId, ServerStatus.stopped);
        LinkLogger.shutdownLogManager(linkId);

        String logFileLocation = LinkLogger.getLogFileLocation(linkId);
        File log = new File(logFileLocation);
        if (log.exists()) {
            log.delete();
        }
    }

}